Python CPython up to 3.14.x profiling.sampling/asyncio stack-based overflow

Summaryinfo

A vulnerability was found in Python CPython up to 3.14.x and classified as critical. Impacted is an unknown function of the component profiling.sampling/asyncio. Executing a manipulation can lead to stack-based overflow. This vulnerability is registered as CVE-2026-5713. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Python CPython up to 3.14.x and classified as critical. This vulnerability affects an unknown code of the component profiling.sampling/asyncio. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The "profiling.sampling" module (Python 3.15+) and "asyncio introspection capabilities" (3.14+, "python -m asyncio ps" and "python -m asyncio pstree") features could be used to read and write addresses in a privileged process if that process connected to a malicious or "infected" Python process via the remote debugging feature. This vulnerability requires persistently and repeatedly connecting to the process to be exploited, even after the connecting process crashes with high likelihood due to ASLR.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-5713 since 04/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 306474 (Linux Distros Unpatched Vulnerability : CVE-2026-5713), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.15.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (306474) and CERT Bund (WID-SEC-2026-1121). Once again VulDB remains the best source for vulnerability data.

Affected

• Red Hat Enterprise Linux
• Fedora Linux
• Oracle Linux
• SUSE openSUSE
• RESF Rocky Linux
• Open Source Python

Productinfo

Type

• Programming Language Software

Vendor

• Python

Name

• CPython

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14

License

• open-source

Website

• Product: https://github.com/python/cpython/

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Once again VulDB remains the best source for vulnerability data.

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